Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1ca3f82d1c5f86…

MALICIOUS

PDF

80.7 KB Created: 2021-07-04 23:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24fcf023e07e09c4c396fab19eef51f2 SHA-1: 7521b4b57a19205013e75e4437aa3b88f4a31fc6 SHA-256: 9a1ca3f82d1c5f8615d29cf362cf67b02299eff3ab4c5090afb1823c2b412f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which is a common technique for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e6o14f0tltstov6vo499cp2bfs/gipukatu.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u529v99iiriauqaaisfoaoai83/boxudulukubi.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a28748b04---letoxuvagovenojozenimeni.pdf
    • http://whkmradio.com/userfiles/file/zamudunewofixesataje.pdf
    • http://bbdecontra.com/userfiles/files/vuvuwesosadapakujigene.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ec7a46c6---fuwawozelududewob.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3a849a94---lideva.pdf
    • http://orhs76reunion.com/clients/30721/File/96342615682.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2663e19e73---10675715670.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gpr21cobgdk98edg8i8mmu9d78/11711193114.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7eaf8218055c9d67ceb8efee5738e5a6/buzufivafulukagunaga.pdf
    • http://guerrazzi.info/userfiles/files/72301124229.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89dede8320---fobavojisoxoribozixoworij.pdf
    • https://bisnismedsos.com/userfiles/file/77102862384.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b3a5f77afff41c251cfb40b0b1ba16e/witalifobopufipijewalaxid.pdf
    • https://sinhadventure.com/uploads/file/zeradixawedidar.pdf
    • http://osc-pribor.ru/products_pictures/file/35576492316.pdf
    • http://j-club.eu/userfiles/file/lelolo.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/594gaf49jsppjklhir7eabe49f/tubanapapegowuxetuxazof.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fff5640c6e7ab49c638404bd5cc25fc6/12309375843.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/lesowokotaxinaguzoso.pdf
    • http://sun-eko.eu/files/file/96697737477.pdf
    • http://files.ibiza-ferien.de/file/64138835329.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2857081038---37495265723.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/90823604641.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cb1e371973046d1acf0e57a59e437622/dejonibedenuruvuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chad+michael+murray+and+paris+hilton
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c7.bin
1bc718cc747a8c6d5dd1886cc6c07d8e50a4f6175288ac1c22fd929f8fa5bced
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 11024 bytes
font_01_sfnt_off0000f03b.bin
36db292d1880bbfab1100910cc5678507e5579096ffb5dbb97f50b4a97382ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 17236 bytes
font_02_sfnt_off00011d3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes